4-5x(x-3)+2x=-2

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Solution for 4-5x(x-3)+2x=-2 equation:


Simplifying
4 + -5x(x + -3) + 2x = -2

Reorder the terms:
4 + -5x(-3 + x) + 2x = -2
4 + (-3 * -5x + x * -5x) + 2x = -2
4 + (15x + -5x2) + 2x = -2

Reorder the terms:
4 + 15x + 2x + -5x2 = -2

Combine like terms: 15x + 2x = 17x
4 + 17x + -5x2 = -2

Solving
4 + 17x + -5x2 = -2

Solving for variable 'x'.

Reorder the terms:
4 + 2 + 17x + -5x2 = -2 + 2

Combine like terms: 4 + 2 = 6
6 + 17x + -5x2 = -2 + 2

Combine like terms: -2 + 2 = 0
6 + 17x + -5x2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-1.2 + -3.4x + x2 = 0

Move the constant term to the right:

Add '1.2' to each side of the equation.
-1.2 + -3.4x + 1.2 + x2 = 0 + 1.2

Reorder the terms:
-1.2 + 1.2 + -3.4x + x2 = 0 + 1.2

Combine like terms: -1.2 + 1.2 = 0.0
0.0 + -3.4x + x2 = 0 + 1.2
-3.4x + x2 = 0 + 1.2

Combine like terms: 0 + 1.2 = 1.2
-3.4x + x2 = 1.2

The x term is -3.4x.  Take half its coefficient (-1.7).
Square it (2.89) and add it to both sides.

Add '2.89' to each side of the equation.
-3.4x + 2.89 + x2 = 1.2 + 2.89

Reorder the terms:
2.89 + -3.4x + x2 = 1.2 + 2.89

Combine like terms: 1.2 + 2.89 = 4.09
2.89 + -3.4x + x2 = 4.09

Factor a perfect square on the left side:
(x + -1.7)(x + -1.7) = 4.09

Calculate the square root of the right side: 2.022374842

Break this problem into two subproblems by setting 
(x + -1.7) equal to 2.022374842 and -2.022374842.

Subproblem 1

x + -1.7 = 2.022374842 Simplifying x + -1.7 = 2.022374842 Reorder the terms: -1.7 + x = 2.022374842 Solving -1.7 + x = 2.022374842 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.7' to each side of the equation. -1.7 + 1.7 + x = 2.022374842 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + x = 2.022374842 + 1.7 x = 2.022374842 + 1.7 Combine like terms: 2.022374842 + 1.7 = 3.722374842 x = 3.722374842 Simplifying x = 3.722374842

Subproblem 2

x + -1.7 = -2.022374842 Simplifying x + -1.7 = -2.022374842 Reorder the terms: -1.7 + x = -2.022374842 Solving -1.7 + x = -2.022374842 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.7' to each side of the equation. -1.7 + 1.7 + x = -2.022374842 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + x = -2.022374842 + 1.7 x = -2.022374842 + 1.7 Combine like terms: -2.022374842 + 1.7 = -0.322374842 x = -0.322374842 Simplifying x = -0.322374842

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.722374842, -0.322374842}

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